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What should be the intelligence quotient of a patient with intellectual disability?
Their intelligence is 2 standard deviations below the normal, which amounts to an intelligence quotient of 70.
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How do we measure the intelligence of an individual?
It is an inconsistently loosely, defined, multi-faceted concept, which is hard to measure, though reliable, and valid tools normalized with thousands of scores to average at 100, exist for the assessment of specific aspects of intelligence e.g. processing speed, verbal IQ, etc. The Wechsler Adult Intelligence Scale is a full-scale intelligence quotient, both verbal and nonverbal intelligence, by a series of different testing methods performed. We design them for individuals, not for groups. Experimenters have constructed them based on the normal distribution of general intelligence.
Intellectual disability
What exactly is intellectual disability?
An intellectual disability, previously "learning disability or mental retardation” by definition has impairments in three other areas besides the lower than normal intelligence quotient. Impaired ability to understand information, and learning skills, and coping independently with daily matters of personal nature. It starts before adulthood and persists through life.
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